Crypto PDF AI Report 'Analysis Unavailable' & Changelog Image Generator for Patches

Release digest

Crypto PDF AI Report 'Analysis Unavailable' — Fixed backend/ai/client.py to immediately skip 404 errors (model not available in region) instead of retrying the same unavailable model 3 times. The fallback chain now moves instantly to the next available model (gemini-2.5-pro, then gemini-2.0-flash), eliminating the "AI generation failed" error in the Crypto PDF report.
Changelog Image Generator for Patches — Fixed scripts/generate_changelog.sh to auto-detect the latest version from CHANGELOG.md and increment the patch number automatically, instead of using a hardcoded 3.2.10. This prevents duplicate version entries that caused the sync_changelog_to_app.py script to skip image generation (since the image file already existed for that version).

Frontend Bundle Optimization — Implemented strategic chunking for dashboard_app
- Extracted heavy vendor dependencies (html2canvas, jspdf, @nivo, d3, lodash) into separate <500 KB chunks.
- Eliminated the >600 kB Vite bundle size warning upon build.
- Reduced main index.js initial load chunk size down to ~84 KB.
- Removed deprecated _deprecated/pdfGenerator.js codes to prevent vendor bloat.